Heating means for vertical digesters.



O. W. MORDBN.

HEATING MEANS FOR VERTICAL DIGESIERS.

APPLICATION FILED JUNE 5, 1012.

4 SHEETS-SHEBT l.

W/ TIVESSES:

IIVVE/VTUI? M [0mm ATTORNEY Patented Mar. 17, 1914.

G. W. MORDEN.

HEATING MEANS FOR VERTICAL DIGESTERS.

APPLICATION FILED JUNE 5,1912.

1,090,331 Patented Mar. 17, 1914.

4 SHEBTS-SHBET 2.

W/TNESSES. INVENTOR A TTORNEY C. W. MORDEN.

HEATING MEANS FOR VERTICAL DIGESTERS.

APPLICATION FILED mm: 5, 1912.

1,090,331 Patented Mar. 17, 1914.

4 SHEETS-SHEET 3.

0. W. MORDEN. HEATING MEANS FOR VERTICAL DIGESTERS.

APPLICATION FILED JUNE 5, 1912.

1,090,331 Patented Mar. 17, 1914 c Q 9 w 5 m %1 F w W OZ -zi g e 1 7 9 e L f I 5 Fry .10. F .12. W/M/ESSES: i l/Vl/FVTOF w E 9 J3 A TTOR/VEY CHARLES W. MORDEN,

0F PORTLAND,

OREGON.

HEATING MEANS FOR VERTICAL DIGESTERS.

Specification of Letters Patent.

Patented Mar. 17, 1914.

Application filed June 5, 1912. Serial No. 701,933.

To all whom it may concern Be it known that I, CHARLES W'. Mononn, a citizen of the United States, residing at Portland, county of Multnomah, State of Oregon, have invented a new and useful improvement in Heating Means for Vertical Digesters, of which the following is a specification.

This invention relates to digesters of the vertical type, such as used in the making of paper pulp.

The purpose of my invention is the at tainment of the following beneficial results: To have the heat distributing means so arranged that they are self supporting, practically each element inserted in the digester serving as effective heating means, thus eliminating all supplementary parts serving merely as a support for the heat distribut inn means. This improvement, among other matters, concerns particularly economy of installation, in doing away with expensive parts serving merely as brackets or the like, as used in spiral coil heaters. I furthermore build each heating unit of a plurality of interchangeable sections. This feature renders convenient the installation of the heating units in the digester. It also renders repair convenient, for any section of the units may be removed and replaced by another if required. I furthermore contrive to so arrange the heating pipes as to assure that all are constantly properly drained of condensation. This is very desirable, since those pipes in which condensation collects are rendered partially inetiicient. In so arranging the heating pipes that they will be spaced from the walls of the digester in the greater part, in order that the cook or material being treated in the digester may freely circulate around the heating pipes and will not be confined by any parts abutting directly from the walls of the digcster. To have the heating means of the digester arranged into two independent units which may be used simultaneously or independently, or either unit may be installed by itself in a digestcr, as convenient. To have the heating means so arranged as to provide especially good heat distribution in. the bottom of the digester, having reference in this connection, in particular, to digesters made with conical bottoms.

An incidental effect obtained by the described arrangement of the heating pipes is that there will be few punctures required through the shell and lining of the walls of the digester for the inlets and outlets of said heating units, and in so doing limiting the places which require special attention, by reason of being likely to become exposed to the action of the acid used in the digesting process, because of the protecting surfaces for such places being broken.

Other features of my invention will appear from the specific description hereinafter given.

In the accompanying drawings constituting a part of this specification: Figure 1 is a diagranmiatic elevation of a vertical digester embodying my invention, and illustrating the arrangement of the external piping for the admission of steam, and. drainage of condensation, for both the upper and lower heating units, as well as the usual pipe connections of digcsters of the type referred to; Fig. 2 is a partial elevation, partly in section, of the lower portion of such digester, showing the arrangement of the lower and upper heating units; Fig. 3 is a partial elevation and partial section of the lower heating unit, showing the specific features of the latter; F 3 is a detail of the closed end and wedged shaped cap of the heating pipes of such lower unit; Fig. {l shows a section of the base of the lower heating unit, and the means employed for effecting a union of the lower ends of the pipes of such heating unit with said base; F ig. 5 shows a different species of the means for accomplishing the same union; Fig. (3 is a section on line A-r\ of Fig. i; Fig. 7 is a section on line 13-43 of Fig. 5; Figs. 8 and 9, respectively, show different modes of constructing the upper heating unit of a plurality of sections either of which may be removed and replaced by another for repair, also rendering convenient the installation of this heating unit in the digester, as already mentioned; Figs. 10,11 and 1). illustrate ditl'eront modcsof eifectingaunion between the ends of the pipes of the upper heating unit and the hollow rings of such heating unit; Fig. 13 is a plan view of a p01 tion of such ring, showing a method of joining the two last units of such ring, in case such end sections do not come properly to gethcr; and Fig. 1 is a part section and part elevation of a modified form of base for the lower heating unit; this form consists of a plurality of interchangcable sections connected by flanges.

The upper heating unit, a, (as shown in Fig. 2) consists of upper and lower hollow rings, 0, (Z, connected by pipes f. Each of such hollow rings is built of a plurality of companion sections, 0, (Z, respectively, and the companion sections are connected by the heating pipes f. The means employed for connecting the ends of the pipes, f, with said hollow ring sections may be varied, as convenient. Modes for efi ecting such connection are illustrated in Figs. 8 and 9, and the details shown in Figs. 10, 11 and 12. Briefly described, these various connecting modes consist of the following means: In Fig. 8 is illustrated a common type of pipe connection. In Fig. 10 the hollow ring, (Z, is shown as consisting of a plurality of sections, 6, each section being provided at its ends with flanges and is fastened to its adjoining section by bolts, as at n. The pipes, f, are welded to the sections, 6, as at m. In Fig. 11 the connection is made through a nipple m, threaded into the section 6 and bearing against the flanged base, F, of the pipe f. A packing m is adapted to protect the threads from acid in the digester. The sections of the upper ring, 0, are constructed and joined substantially the same as the sections of the ring (Z, and will therefore not be detailed herein. Fig. 12 illustrates a method of connecting two sections, 6 6 having the pipes, f threaded therein, the union being accomplished by means of a nipple 7, provided with dit' ferential threads 79, 72,3, and formed with an octagon periphery z on which is mounted an octagon collar 2', adapted for the application of a wrench, the threads of the pipes being protected by the packing g. The last described features constitute a contemporaneous invention specifically shown and described in the application for Letters Patent of this applicant, filed August 16, 1912, Serial Number 715,517. Fig. 13 shows a method of connecting the last sections of the hollow rings, in case such end sections do not properly come together. Such method consists of plugging the ends as at y, j, and to insure the alinement I have provided a sleeve 76, in which the ends are inserted and secured by the set-screws a. The heater will be supported by the triotion contact of the lower heating unit with the sides of the digester, or by direct bearing upon the lower heating unit.

As shown in F 1., the upper and lower heating units a, 6 are independently supplied with steam through the main feeder pipe 1, connected with a boiler not shown. The flow of steam is controlled by reducing valves, 2, 2, supplemented by the auxiliary valves, 3, 3, above and 4t, 4, below, and a valve controlled bypass, 5, 5, by which steam can. be admitted to the heating units when the reducing valve is temporarily out out by closing the related valves, 3, 4. Steam pressure gages, 6, 6, are provided for determining the pressure of the steam in the heating units. The pipe, 7 conducts steam to the upper heating unit a. The steam condensation of such upper unit is discharged through the pipe 8, provided with a common trap at 9, the condensation being thence discharged through the pipe 10 to the hot water storage tank, not shown. When starting the upper heating unit, the air confined therein may be allowed to escape through the pipe 11, controlled by a valve 12. A pipe 13 conducts the steam to the lower heating unit, and the condensation in the latter is discharged through the pipe 14, provided with a trap 15, and being thence discharged through pipe 10 into the hot water storage tank. The pipe 16 connects with the main steam pipe 1, and the former leads to the usual valve mechanism common to digesters of the type referred to. Such valve mechanism consists of a valve, 18, for controlling the admission of steam above the cook for the purpose of steaming the chips previous to starting the cook, a valve, 19, for controlling the admission of the liquor used, a valve 20 for controlling the admission of water for washing after the cook has been completed, and a valve 21 for controlling the escape of evolved during the cooking process. There is in addition a main valve, 22, which controls the opening into the digester with which the group of valves above mentioned communicate. Fig. 1 further shows a valve, 18, for admitting direct steam to the bottom of the digester, also an acid drain valve, 19*, a valve 2O controlling the wash water admission, and a valve 21 controlling a drain for condensed steam from the steaming chips and the main valve. By reason of the valves at the top and bottom being shown diagrammatically, the main valve is not indicated at the bottom, but in practice is positioned like the main valve 22 of the valves at the top of the digester, but arranged in a horizontal plane. The lower heater unit, 6, consists of a single ring-like base, 7), and a plurality of upwardly extending pipes 0, closed at their upper ends, as shown in Fig. 3. The pipes, 0, are connected to the base 7) by a dil'l'erential thread. nipple, illustrated in Figs. 4; and 5. In the former the nipple, q, is formed with its inner surface 7" adapted to receive a turning bar, (see Fig. 6) and the latter may be inserted through an orifice, normally closed by a plug 8.

In Fig. 5 the nipple 9 may be turned by the nut t, in the same manner as shown in Fig. 12. The upper ends of the pipes 0 are shaped to conform with the lower ring of the upper heating unit, and for this purpose they may be formed with a removable wedge a, as shown in dotted lines in Fig. 8, or the wedge may be dispensed with and alinement between the two heaters secured by a filling, such as lead. The said wedge, 11, when removed, leaves a space, 0), between the upper heating unit and the pipe 0, sullicient to allow for the removal of the latter, as shown in Fig. 3. The pipes, 0, are also provided with outwardly extending lugs, 10, which bear against the sides of the digester, thus making the heater self-supporting. In digesters having a downward discharge through the bottom, the said discharge is efiectcd through the ring-like base 7?. Where the discharge is outward from the side, the said base p may be covered with. a screen, a", which prevents pulp contained in the digester from clogging the inlet and drain pipes embodied in the device, 17, shown in Fig. 1.

It will be noticed that the construction of the heater elements is such that a discharge outward from the side, as through the orifice e (see Fig. 2) may be made without any interierence on the part of the heaters themselves. In the lower heater the steam is admitted directly to the base 7), through the Dipe 13, as previously described. A similar pipe 1 1 from the base removes the condensed steam. In the upper heater the steam is admitted to one side of the upper ring 0, through the pipe 7, and a similar pipe 11, on the opposite side, or in any convenient place, allows the escape of air. A drain pipe 8, shown in Fig. 2, connects with the lower ring (Z of the upper heater and removes the condensed steam through the trap 9. The sections p of the base 7) are connected by the flanges 0 The construction of these sections is such that they are interchangeable and any one or more may be conveniently removed for purposes of repair. The installation of the lower heater unit is also facilitated by having such base built in sections. The pipes 0 are connected to the sections 72 in the same manner as before described, the nipple and the plug 8 being the same also.

I claim:

1. The combination in a digester, of two heater units supported one above the other; the lower heater unit comprising a hollow base and a plurality of upwardly extending pipes atlixed on such base, said pipes opening into the base at their lower ends and being closed at their upper ends; the upper heater unit comprising upper and lower hollow rings; upwardly extending pipes connecting said rings; an inlet and an outlet, for the heating agent, for each heater unit; means for controlling the admission of the heating agent to said heater units; said controlling means comprising a reducing valve, a valve controlled bypass, and means for temporarily cutting out the reducing valve when the bypass is to be used; and an air relieil. for the heater units.

2. The combination in a digester, of two heater units supported one above the other; the lower heater unit comprising a hollow base and a plurality oi upwardly extending pipes a'llixed on such base, said pipes opelr ing into the base at their lower ends and being closed at their upper ends; the upper heater unit comprising upper and lower hollow rings; upwardly extending pipesconnecting said rings; and an inlet and an outlet, for the heating agent, for each heater unit.

3. In a digester, a heater comprising upper and lower hollow rings, and upwardly extending pipes conncctin said rings pipes formed with an outwardly bent port-ion whereby the pipes of the heater are supported by the walls of the digester and spaced therefrom in greater part.

4. The combination in a digester, of two heater units supported one above the other; the lower heater unit comprising a hollow base and a plurality of upwardly extending pipes allixed on such base, said pipes opening into the base at their lower ends and being closed at their upper ends, the latter adapted for supporting the lower ring of the upper heater unit; the upper heater unit comprising upper and lower hollow rings, and upwardly extending pipes connecting said rings.

The combination in a digester, of two heater units supported one above the other;

the lower heater unit comprising a hollow base and a plurality of upwardly extending pipes ailixed on such base,-said pipes opening into the base at their lower ends and being closed at their upper ends; the upper heater unit comprising upper and lower hollow rings, and upwardly extending pipes connecting said rings, said pipes formed to include a portion whereby they are supported by the walls of the digester and spaced therefrom in greater part.

6. The combination in a digester, of two heater units supported one above the other; the lower heater unit comprising a hollow base and a plu'ality oil upwardly extending pipes allixed on such base, said pipes opening into the base at their lower ends and being closed at their upper ends; the upper heater unit comprising upper and lower hollowrings each constructed of sections fastened end to end, the sections oi" one ring being companions to those of the other, and upwardly extending pipes connecting such companion sections of said rings; and means whereby said pipes are supported by the walls of the digester and spaced therefrom for the greater part.

7. The combination in a digester, of two heater units supported one above the other;

a lower heater unit comprising a hollow structed of sections fastened end to end, base built in sections fastened end to end the sections of one ring being companions 3.0 and a plurality of upwardly extending pipes to those of the other, and upwardly extendafiiXed on such sections of the base, said ing pipes connecting said rinps' pipes opening into the base sections at their CHARLES "W. MORDEN. lower ends and being closed at their upper Witnesses:

ends; the upper heater unit comprising CECIL LONG,

upper and lower hollow rings each 0011- i W. LEWIS C001 Gopics of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. C." 

